I've had my MB for almost a year and I started having a problem with the "equal" key. I press the key and I get nothing and the Mac makes the sound it makes when you press a wrong key (a little blonk type sound). When I press the shift/equal key I DO get the plus sign. Thinking it might be the actual keyboard itself thats causing the problem I plugged my MB into my KVM switch and used a standard windows keyboard and....I get the exact same results. Any ideas???